JP5007255B2 - Underground wall structure - Google Patents

Description

  The present invention relates to an underground wall structure.

An underground wall structure in which a sheet pile is connected to an H-shaped steel, which is the core material of the solidified wall, and the underground wall structure in which a joint member having a shape engageable with the sheet pile joint is directly attached to the H-shaped steel is patented. Illustrated in Document 1. According to the invention of Patent Document 1, it is possible to use a solidified wall and a sheet pile wall in accordance with the situation at the site and the like, so that it is possible to reduce costs.
JP 2002-81058 A

  By the way, the invention of Patent Document 1 includes a form in which the joint member is directly attached to the H-shaped steel web. When the joint member is directly attached to the H-shaped steel web, the fitting work of the joint member is hindered. Since it is necessary to provide the joint member at a planar position where the sheet pile does not come into contact with the flange of the H-shaped steel, the sheet pile may not be disposed at a desired planar position. Moreover, in patent document 1, there also exists a problem that the connection position of a sheet pile will be limited to the surface vicinity of H-section steel. That is, in the underground wall structure of Patent Document 1, the position and orientation of the sheet pile connected to the solidified wall may be restricted.

  From such a viewpoint, it is an object of the present invention to provide an underground wall structure in which a sheet pile is connected to a solidified wall and in which the position and orientation of the sheet pile are not easily restricted.

  The underground wall structure according to the present invention for solving such a problem is an underground wall structure in which a sheet pile is connected to a solidified wall, and the solidified wall is a wall main body formed of a solidified material, and the sheet pile. Connecting core material disposed in the connecting portion, and the connecting core material is a main body portion embedded in the wall main body, a joint portion provided at a position separated from the main body portion, and A connecting portion interposed between the main body portion and the joint portion, the joint portion having a shape engageable with a sheet pile joint provided on the sheet pile, and the sheet pile It is characterized by engaging with a joint.

  According to the present invention, since the joint portion is provided at a position separated from the main body portion of the connecting core material, the position and orientation of the sheet pile are less likely to be restricted than when the joint portion is directly attached to the main body portion. Become. The solidified wall includes at least a mortar wall, a concrete wall, a soil cement wall, and a muddy water solidified wall.

The main body of the connecting core may be formed of a shape steel having a web and a pair of flanges (for example, an H-shape steel, an I-shape steel, a groove shape steel, etc.). If it does in this way, it will become possible to reduce the procurement cost of the connecting core material which is an accessory. In addition, in the invention which concerns on Claim 1, one flange is located in the excavation space side, and the other flange is located in the natural ground side. Moreover, in the invention which concerns on Claim 1, the half member formed by cut | disconnecting a steel sheet pile in the center part of the width direction is made into the joint part and connecting part of the connecting core material, and it digs more than the intermediate position of both the said flanges. The connecting portion is fixed to the web at a position close to the space side, and the flange on the ground side of the main body and the web of the sheet pile are flush with each other.

  When the main body of the connecting core is made of steel, it is desirable to position the joint on the sheet pile side than the plane connecting the edges on the sheet pile side of the two flanges, or It is desirable to position the joint portion on the sheet pile side with respect to the cylindrical surface circumscribing the main body portion. If it does in this way, it will become possible to set the position and direction of a sheet pile, without caring about the existence of a shape steel. If the joint part is positioned on the sheet pile side from the above-described cylindrical surface, the connection core material can be positioned with reference to the joint part, so that the installation accuracy of the connection core material is improved. In the case where the sheet pile is built after the solidified material is solidified, the press-fit resistance of the sheet pile can be reduced.

In addition, in order to position the joint part of the connecting core material on the sheet pile side from the above-described plane, for example, the joint part is projected from the web, and the joint part is provided at the distal end of the joint part. or, alternatively, the addition to bridging a plurality of connecting portions spaced apart in the depth direction between the sheet pile side edge of both flanges, said joint portion is provided above the side surface of the sheet pile side of each connecting portion That's fine.

  In the case where the connecting portion of the connecting core is extended from the web of the main body, the connecting core is provided with a bracket extending from the flange toward the connecting portion, and the tip of the bracket is connected to the connecting portion. It is good to adhere to the part. If it does in this way, it will become possible to control the bending etc. which occur in a connecting part when building a connecting core material. In addition, since it becomes possible to suppress the bending and the like generated in the connecting portion even before the solidified material to be the wall body is cured, even if the sheet pile is built before the solidified material is cured, the joint An error is unlikely to occur in the position of the part.

  According to the underground wall structure according to the present invention, the position and orientation of the sheet pile are less likely to occur.

An example of the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.
The underground wall structure according to the present embodiment is an underground wall structure in which a sheet pile wall B is connected to a solidified wall A as shown in FIG. The sheet pile wall B is formed by connecting a plurality of sheet piles 4, 4,..., And is formed at a position where the solidified wall A is extended in the length direction (right direction in FIG. 1). In addition, in this embodiment, although the case where the solidification wall A and the sheet pile wall B are earth retaining walls at the time of digging the natural ground G is illustrated, it is not the meaning which limits the use, scale, etc. of the solidification wall A and the sheet pile wall B. .

  The solidified wall A is a columnar continuous underground wall, and is connected to the wall main body 1 formed of the solidified material, the connecting core material 2 arranged at the connection portion of the sheet pile wall B, and the wall main body 1 at appropriate positions. The reinforcing cores 3, 3,... Arranged are provided. In addition, although illustration is abbreviate | omitted, it does not interfere even if the solidification wall A is a wall type (equal thickness type) continuous underground wall.

  The wall body 1 is made of a solidified material that has been solidified (hardened) in an unillustrated excavation hole (excavation groove). There are no restrictions on the type of solidification material, and it is appropriate depending on the geology of the natural ground and the strength required for the solidification wall A from among mortar, concrete, soil cement, mud water (bentonite) containing a solidifying agent, etc. Should be selected.

  The connecting core 2 is interposed between a main body 2a embedded in the wall main body 1, a joint 2b provided at a position spaced from the main body 2a, and the main body 2a and the joint 2b. And a connecting portion 2c. In the present embodiment, not only the main body 2a but also the joint 2b and the connecting portion 2c are embedded in the wall main body 1.

  The main body 2a plays a role of reinforcing the wall main body 1 and a role of supporting the connecting portion 2c. In the present embodiment, the main body 2a is made of an H-shaped steel having a web 21 and a pair of flanges 22 and 22. The longitudinal direction of the wall main body 1 is arranged in the depth direction (the direction perpendicular to the paper surface in FIG. 1). The main body portion 2a is arranged in such a direction that one flange 22 faces the natural ground G and the other flange 22 faces the excavation space V formed by digging down the natural ground G. That is, the main body 2 a is arranged so that the web 21 is along the wall thickness direction of the wall main body 1.

  As shown in FIG. 2, the joint portion 2 b has a shape that can be engaged with a sheet pile joint 4 b provided on the sheet pile 4. In the present embodiment, the joint portion 2 b has the same shape as the sheet pile joint 4 b (cross-sectional shape). Is formed. The joint portion 2b of the present embodiment is provided at the distal end portion of the connecting portion 2c, and is located on the side of the sheet pile 4 with respect to the plane P connecting the edges of the flanges 22 and 22 on the sheet pile side. Although there is no restriction | limiting in the position of the joint part 2b, In this embodiment, it is set as the position where the web of the sheet pile 4 connected to the joint part 2b becomes flush with the flange 22 by the side of the natural ground G of the main-body part 2a. The joint 2b extends in the depth direction (the direction perpendicular to the paper surface in FIG. 2). Further, the inner space of the joint 2b (the space in which the sheet pile joint 4b is inserted) is filled with a protective member (not shown) (for example, foamed urethane, foamed polystyrene, or the like) that prevents infiltration of the solidified material.

  The connecting portion 2 c is fixed to the surface of the main body 2 a on the side of the sheet pile 4 of the web 21, and projects from the web 21 toward the side. The connecting portion 2c of the present embodiment has a shape in which a flat plate is bent in a “<” shape, and extends in the depth direction (the direction perpendicular to the paper surface in FIG. 2). If it demonstrates in detail, the connection part 2c of this embodiment protrudes from the position which approached the other flange 22 side (digging space V side) rather than the center of the web 21, and the flange 22 extends from the web 21 to the plane P. The web 21 is opposed to the web 21 by being bent to one flange 22 side (the ground G side) near the plane P.

  The joint part 2b and the connection part 2c of this embodiment consist of a halved member formed by cutting a steel sheet pile having the same cross section as a sheet pile 4 to be described later at the center in the width direction. When the depth of the sheet pile wall B is larger than the standard length of the steel sheet pile, a plurality of half members are connected in the longitudinal direction. In this case, the half members (the joint portion 2b and the connecting portion) The parts 2c) may be directly connected to each other, or as shown in FIG. 3, two halved members may be arranged with an interval in the vertical direction. In addition, when separating two vertically adjacent half members, it is good to arrange | position up and down across the seam of H-section steel used as the main-body part 2a. If it does in this way, it will become possible to perform the welding operation | work of H shape steel adjacent up and down from the surface side to which the connection part 2c is connected.

  When the two halved members are separated from each other in the vertical direction, the guide members 2d and 2d may be disposed between the end surfaces of the joint portions 2b and 2b adjacent in the vertical direction. The guide members 2d and 2d serve as guides when the sheet pile joint 4b (see FIG. 2) passes through the boundary portion of the joint portions 2b and 2b, and in this embodiment, the inner space of the joint portion 2b Opposite across the (groove).

  The reinforcing core material 3 shown in FIG. 1 is arranged according to the strength required for the solidified wall A and the like. The reinforcing core material 3 of the present embodiment is made of H-shaped steel having the same dimensions as the main body portion 2a of the connecting core material 2, and the longitudinal direction thereof is the depth direction of the wall main body 1 (the direction perpendicular to the paper surface in FIG. 1). It is arranged to become. The size and shape of the reinforcing core material 3 may be different from those of the main body 2a of the connecting core material 2, and a shape steel or a reinforcing bar other than H-shaped steel may be used as the reinforcing core material. . Further, when the performance required for the solidified wall A can be satisfied only by the strength of the wall body 1 (strength of the solidified material), the reinforcing core material 3 may be omitted.

  The sheet pile 4 is a U-shaped steel sheet pile, and includes a sheet pile main body 4a and a pair of sheet pile joints 4b and 4b formed integrally on both side edges of the sheet pile main body 4a. The sheet pile main body 4a is a U-shaped section formed by a web and a pair of flanges, and the sheet pile joint 4b is a section-shaped section projecting sideways from the flange of the sheet pile main body 4a. Although each sheet pile 4 is mutually connected by engaging the sheet pile joint 4b with the sheet pile joint 4b of the other adjacent sheet pile 4, one sheet pile joint 4b of the sheet pile 4 adjacent to the connecting core 2 is It is engaged with the joint 2b of the reinforcing core 2. In addition, although illustration is abbreviate | omitted, even if it uses steel sheet piles of forms other than U shape, such as Z shape, a linear shape, H shape, and a steel pipe shape, it does not interfere.

  Next, the construction procedure of the underground wall structure having such a configuration will be described. In the following, a case where the solidifying material is soil cement will be exemplified.

  First, a single-axis or multi-axis earth auger (not shown) is used to form an excavation hole (excavation groove) with a predetermined depth, and the soil and cementitious suspension at the current position are agitated inside the excavation hole. Mixing to form a soil cement (solidifying material), before the fluidity of the soil cement is impaired, using a mobile crane (not shown) to build the reinforcing cores 3, 3, ..., The connecting core material 2 is built in a position to be a connection portion with the sheet pile wall B (in this embodiment, a side end portion of the solidified wall A).

  In addition, when the suspending point which balances with the gravity center of the connection core material 2 cannot be found at the upper end of the main body part 2a, a suspending point may be provided at the upper end of the connecting part 2c. Although not shown, a jig made of a plate material, a frame material, or the like may be fixed to the upper end of the connecting core 2 and a hanging point may be provided on the jig.

  If the soil cement around the connecting core 2 is solidified, the sheet pile 4 is engaged with the joint 2b of the connecting core 2 while the sheet pile 4 is engaged with the soil cement (wall body 1) and the ground. Drive into the mountain G. Specifically, the sheet pile 4 is press-fitted into the wall body 1 and the natural ground G by a static penetration method or a dynamic penetration method, and the sheet pile joint 4b is inserted into the joint portion 2b from the upper end side of the connecting core 2. That's fine. Since the joint member 2b is filled with the protective member (not shown), the inner space of the joint portion 2b is not filled with the soil cement. Therefore, the joint portion 2b and the sheet pile joint are not filled. There is no occurrence of a phenomenon (so-called wedge phenomenon) that inhibits the engagement with 4b.

  After that, when a desired number of sheet piles 4, 4,... Are connected next to the sheet pile 4 connected to the connecting core member 2, the construction work of the underground wall structure is completed.

  According to the underground wall structure according to the present embodiment described above, it is possible to join the two in a state where the water stop performance at the boundary portion between the solidified wall A and the sheet pile wall B is enhanced. Since the joint 2b is provided at a position spaced from the main body 2a of the connecting core 2, the position and orientation of the sheet pile 4 are restricted as compared with the case where the joint 2b is directly attached to the main body 2a. It becomes difficult.

  In addition, according to the underground wall structure according to the present embodiment, the solidified wall A and the sheet pile wall B can be used in combination according to the situation at the site and the like, so that the cost can be reduced. . For example, if the depth of the underground wall varies depending on the location, constructing the deeper part with the solidified wall A and constructing the smaller depth part with the sheet pile wall B reduces the construction cost of the underground wall It becomes possible to do.

The configuration of the connecting core 2 is not limited to the illustrated one, and may be changed as appropriate.
For example, as shown in FIG. 4, the joint portion 2b may be positioned closer to the sheet pile 4 than the cylindrical surface Q circumscribing the main body portion 2a. That is, the joint portion 2 b may be positioned on the peripheral edge portion of the wall body 1. Of the sheet piles 4, the part including one sheet pile joint 4 b needs to be press-fitted into the wall body 1 (solidification material). However, if the joint portion 2 b is positioned closer to the sheet pile 4 than the cylindrical surface Q, the wall body Since the portion press-fitted into 1 becomes smaller, the press-fitting resistance of the sheet pile 4 can be reduced.

  Incidentally, when the connecting core 2 shown in FIG. 4 is built in the excavation hole (excavation groove), the connection portion 2b may be installed while abutting against the hole wall (groove wall). If it does in this way, since it becomes possible to position the core material 2 for a connection on the basis of the joint part 2b, it becomes possible to improve the installation precision of the core material 2 for a connection.

  In the above-described embodiment, the case where the connecting portion 2c is cantilevered and supported by the web 21 of the main body portion 2a (see FIG. 2), the bracket 2e protruding from the flange 22 toward the connecting portion 2c is provided, You may adhere the front-end | tip part of the bracket 2e to the connection part 2c. The bracket 2e may be made of a shape steel such as an angle steel.

  When the connecting portion 2c is supported by the bracket 2e, it is possible to suppress bending or the like generated in the connecting portion 2c when the connecting core member 2 is built. Further, even when the sheet pile 4 is built before the solidified material to be the wall body 1 is solidified, it is possible to suppress the bending or the like generated in the joint portion 2c, so that the joint portion 2b is positioned. Errors are less likely to occur. In the illustrated embodiment, it is assumed that the plurality of brackets 2e are arranged at intervals in the depth direction, but a long member extending in the depth direction may be used as the bracket 2e.

  Moreover, in above-described embodiment, although the connection core material 2 which fixed the connection part 2c to the web 21 of the main-body part 2a was illustrated, as shown in FIG. 5, the edge by the side of the sheet pile 4 of the flanges 22 and 22 is shown. While connecting part 2c 'may be constructed between, joint part 2b may be provided in the side of the sheet pile 4 side of connecting part 2c'.

  If it does in this way, since the joint part 2b will be located in the sheet pile 4 side rather than the plane P (refer FIG. 2), compared with the case where the joint part 2b is directly attached to the main-body part 2a, the position of the sheet pile 4 or Restriction in direction is unlikely to occur. Further, since the connecting portion 2c 'is supported at both ends, an error is unlikely to occur in the position of the joint portion 2b.

  In addition, there is no restriction | limiting in the structure of connection part 2c ', For example, although connection part 2c' may be comprised with the one steel plate which has a height dimension comparable as the main-body part 2a, as shown in FIG. The connecting portion 2c ′ is composed of a steel material having a small height (flat bar, angle steel, channel steel, rectangular steel pipe, etc.), and a plurality of connecting portions 2c ′ are spaced in the depth direction (height direction). May be arranged. In this case, the joint portion 2b may be a separate member from the joint portion 2c ', and may be fixed to the joint portion 2c' by means such as welding. In this way, it is possible to reduce the weight of the connecting core 2.

  In order to suppress the bending of the connecting portion 2c ', a reinforcing member 2f may be attached to the connecting portion 2c'. The illustrated reinforcing member 2f is located on the opposite side of the joint portion 2b with the joint portion 2c 'interposed therebetween, and is fixed to the surface of the joint portion 2c' on the web 21 side by means such as welding. In addition, although the illustrated reinforcing member 2f is made of angle steel and extends in the depth direction, the configuration of the reinforcing member 2f is not intended to be limited.

  In addition, in this embodiment, although the connection core material 2 was provided in the side edge part of the solidification wall A, and the sheet pile wall B was constructed in the position which extended the solidification wall A, the position of the connection core material 2 was illustrated. It is not intended to limit the positional relationship between the solidified wall A and the sheet pile wall B. Although illustration is omitted, the sheet pile wall B may be crossed at the side end portion of the solidified wall A, the connecting core 2 is arranged in the middle of the solidified wall A, and the sheet pile wall B is branched from the solidified wall A. You may let them.

  Moreover, although the case where the sheet pile wall B which consists of a plurality of sheet piles 4,4, ... was connected to the solidification wall A was illustrated in this embodiment, it is possible to connect one sheet pile 4 to the solidification wall A. .

  Moreover, in this embodiment, although the case where an underground wall structure is utilized as a retaining wall was illustrated, you may utilize as a water-impervious wall, a purification | cleaning wall, a structure foundation, etc.

It is sectional drawing which shows the underground wall structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the core material for connection. It is a perspective view for demonstrating the core material for a connection. It is sectional drawing for demonstrating the modification of the core material for connection. It is sectional drawing for demonstrating the other modification of the core material for connection. It is a perspective view for demonstrating the other modification of the core material for connection.

Explanation of symbols

A solidified wall B sheet pile wall 1 wall main body 2 connecting core 2a main body 21 web 22 flange 2b joint 2c joint 3 reinforcing core 4 sheet pile 4b sheet pile joint P plane Q cylindrical surface

Claims (6)

An underground wall structure in which a sheet pile is connected to a solidified wall,
The solidified wall has a wall body formed of a solidified material, and a connecting core disposed at a connection portion between the sheet piles,
The connecting core material includes a main body part embedded in the wall main body, a joint part provided at a position spaced from the main body part, and a joint part interposed between the main body part and the joint part. And
The main body part is made of a shape steel having a flange located on the side of the digging space, a flange located on the natural ground side, and a web connecting the both flanges,
The joint part and the connecting part are formed of a half member formed by cutting a steel sheet pile at the center in the width direction,
The connecting portion is fixed to the web at a position closer to the moat space than an intermediate position between the flanges,
The joint portion has a shape engageable with a sheet pile joint provided on the sheet pile, and is engaged with the sheet pile joint ,
The underground wall structure , wherein the flange on the natural ground side of the main body and the web of the sheet pile are flush with each other .   2. The underground wall structure according to claim 1, wherein the joint portion is located on the sheet pile side with respect to a plane connecting edges of the two sheet flanges on the sheet pile side. An underground wall structure in which a sheet pile is connected to a solidified wall,
The solidified wall has a wall body formed of a solidified material, and a connecting core disposed at a connection portion between the sheet piles,
The connecting core material includes a main body part embedded in the wall main body, a joint part provided at a position spaced from the main body part, and a joint part interposed between the main body part and the joint part. And
The joint portion has a shape engageable with a sheet pile joint provided on the sheet pile, and is engaged with the sheet pile joint,
The main body is made of a shape steel having a web and a pair of flanges,
The connecting portion protrudes from the web,
The joint is provided at the tip of the joint,
The connecting core includes a bracket that protrudes from the flange toward the connecting portion,
The underground wall structure, wherein the connecting portion is supported by the bracket. 4. The underground wall structure according to claim 3, wherein the joint portion is located on the sheet pile side with respect to a plane connecting the edges on the sheet pile side of the flanges. An underground wall structure in which a sheet pile is connected to a solidified wall,
The solidified wall has a wall body formed of a solidified material, and a connecting core disposed at a connection portion between the sheet piles,
The connecting core material includes a main body part embedded in the wall main body, a joint part provided at a position separated from the main body part, and a plurality of interposed parts interposed between the main body part and the joint part . With a connecting part,
The joint portion has a shape engageable with a sheet pile joint provided on the sheet pile, and is engaged with the sheet pile joint,
The main body is made of a shape steel having a web and a pair of flanges,
The joint portion is located on the sheet pile side from the plane connecting the edges on the sheet pile side of both flanges,
The plurality of connecting portions are arranged at intervals in the depth direction,
Each of the connecting portions is constructed between edges of the two sheet flanges on the sheet pile side,
The underground wall structure, wherein the joint portion is provided on a side surface on the sheet pile side of each connecting portion. The underground wall structure according to claim 1 or 3 , wherein the joint portion is located on the sheet pile side with respect to a cylindrical surface circumscribing the main body portion.

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